Mark A. Vierra, M.D.
Specialist · Poway, CA
Mark A. Vierra, M.D. is a specialist with a practice address in Poway, California, and NPI 1730187121, issued on Jul 11, 2005. Check the license (California A64866, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark A. Vierra
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- A64866 CA
Self-reported in NPPES; status is on the state search - Practice location
- 15525 Pomerado RD, Poway, CA 92064
- Phone
- (858) 451-3311
- Enumerated
- Jul 11, 2005
- Record last updated
- Jul 15, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (858) 451-1142
- Medicaid ID
- 00A648660 CA
- Medicare enrollment
- Enrolled (PECOS I20120213000089); accepts Medicare assignment
- Medical or professional school
- Pennsylvania State University College Of Medicine, 1996
- Entity
- Type 1 · individual
8 nearest specialist records → All 5,749 in California → Look up another NPI →
Also registered at 15525 Pomerado RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Francis Barber, M.D.Specialist1518965011
- Christine Bell - Anderson, AUDAudiologist1689731416
- Philip Bohart, M.DOrthopaedic Surgery Physician1033223425
Verify Mark A. Vierra in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license A64866Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% fewer Medicare Part D claims than the average specialist in 2024
798 Medicare Part D claims for 348 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims. 15 claims were for opioids.
Most prescribed
- Doxycycline Hyclate128 claims
- Triamcinolone Acetonide70 claims
- Ketoconazole58 claims
- Valacyclovir58 claims
- Hydrocortisone50 claims
- Clobetasol Propionate49 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 0 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $425.31
47 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 5,844 providers of this specialty with any payment received $4,760.79 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Bernardo Dermatology Medical Group IncPoway, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark A. Vierra among 5,749 specialist records in California
Mark A. Vierra, M.D. is one of 5,749 specialist records with a practice address in California. 30% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 30% of these records are
- In the CMS Doctors and Clinicians fileYes · 19% of these records are
- Graduated1996 · median 1989 among the 1,075 with a school on file
- Record last updated2010 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
17 specialist records list a practice address in Poway
They are 17 of the 1,306 NPPES records with a practice address in Poway, and 5,749 specialist records in California.
All 5,749 in California → Every provider in Poway → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Francis Barber, M.D.Poway, CA 920641518965011
- Gretchen Erickson, HHPPoway, CA 920641881926392
- Jennifer Keller, P.T.Poway, CA 920641922033828
- Ruth Larson, M.D.Poway, CA 920641538167911
- Jonathan Nissanoff, MDPoway, CA 920641134135155
- Nathan Rendler, M.D.Poway, CA 920641275531337
- Marcelo Rivera, M.D.Poway, CA 920641942311311
- David Salzer, MA, ATC, PTAPoway, CA 920641326007758
Common questions
What is Mark A. Vierra, M.D.'s NPI number?
Mark A. Vierra, M.D.'s National Provider Identifier (NPI) is 1730187121, issued on Jul 11, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark A. Vierra, M.D. located?
The NPPES record lists a practice address at 15525 Pomerado RD, Poway, CA, 92064. Phone: (858) 451-3311. Providers update this record themselves, so call before visiting.
How can I verify Mark A. Vierra, M.D.'s license?
NPPES lists California license number A64866, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Mark A. Vierra, M.D. prescribe under Medicare Part D?
In 2024, Mark A. Vierra, M.D. had 798 Medicare Part D claims for 348 beneficiaries; the average among specialist prescribers was 1,380. Part D covers Medicare prescriptions only.
What is Mark A. Vierra, M.D.'s MIPS final score?
The 2023 MIPS final score is 0 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.